Interferometry

Frame rate phase-shifting interferometer with a frequency-modulated laser diode

[+] Author Affiliations
Ribun Onodera, Yukihiro Ishii

University of Industrial Technology, Sagamihara, Department of Electronics, 4-1-1 Hashimotodai, Sagamihara, Kanagawa?229-1196, Japan

Opt. Eng. 38(12), 2045-2049 (Dec 01, 1999). doi:10.1117/1.602309
History: Received Mar. 26, 1999; Revised June 4, 1999; Accepted June 15, 1999
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Abstract

We develop a laser-diode phase-shifting interferometer that can capture frame-rate phase-shifted interferograms on a video tape with a high capacity for their storage. The number of the video frame is simultaneously recorded on an audio track of the video tape. In a four-step manner, the injection-current variation of the laser diode is synchronized with the field pulse of a CCD camera to produce π/2-step phase shifts at a frame rate of 1/30 s. An intensity distribution of the interferogram on any frame can be determined through a video tape with a frame memory using the recorded frame number. The four successive phase-shifted interferograms are used to calculate a distribution of frozen phase by a phase-extraction algorithm. The phase error due to the frame-by-frame intensity repeatability is theoretically analyzed. © 1999 Society of Photo-Optical Instrumentation Engineers.

© 1999 Society of Photo-Optical Instrumentation Engineers

Citation

Ribun Onodera and Yukihiro Ishii
"Frame rate phase-shifting interferometer with a frequency-modulated laser diode", Opt. Eng. 38(12), 2045-2049 (Dec 01, 1999). ; http://dx.doi.org/10.1117/1.602309


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